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Iridium enrichment and poor fractionation from gold, platinum and palladium in clausthalite (PbSe), Tilkerode, eastern Harz, Germany |
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| Authors: | Alexandre Raphael Cabral Nikola Koglin Helene Br?tz |
| Institution: | 1. Mineral Deposits, Technische Universit?t Clausthal, Adolph-Roemer-Str. 2A, 38678, Clausthal-Zellerfeld, Germany 2. Geodynamics and Geomaterials Research Division, University of Würzburg, Am Hubland, 97074, Würzburg, Germany 3. GeoZentrum Nordbayern, Lithosphere Dynamics, Schlo?garten 5a, 91054, Erlangen, Germany |
| Abstract: | Enrichments in platinum-group elements were found in clausthalite, PbSe, which occurs in carbonate–hematite veins hosted in black shale of Upper Wenlockian age in the eastern Harz, Germany. Spot measurements by laser ablation–quadrupole inductively coupled plasma mass spectrometry (LA–QICPMS) show that the clausthalite has Pt contents that average 0.459?ppm and range from 0.003 to 2.83?ppm. Other noble metals quantified in the present work include Au (0.226?ppm, 0.109–0.451?ppm), Ru (0.061?ppm, 0.006–0.264?ppm), Ir (0.071?ppm, 0.010–0.185?ppm), Pd (0.046?ppm, 0.017–0.107?ppm) and Os (0.010?ppm, <0.003–0.024?ppm). Elemental ratios of Au/Ir, Pd/Ir and Pt/Ir, the average values of which are respectively 4.6, 0.8, and 4.9, suggest that Au, Pd and Pt are poorly fractionated from Ir. The resulting Ir enrichment is unusual and should reflect a particularly soluble (and stable) aqueous complex of Ir in a highly oxidizing, low-temperature, Se-rich solution. |
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